7 day weather forecast

Effective as of 4:00 PM Sunday May 16 2021

Explanatory notes:

Warm until tomorrow with the warm air mass over the region with the high pressure system in the Great Australian Bight. Plenty of high and middle level clouds associated with upper and middle level moisture ahead of an upper level trough.

 A trough brings showers and thunderstorms most likely from late afternoon tomorrow with a moist and unstable atmosphere with steep vertical lapse rates and moist low level air with dew points as high as 19°C and Convective Available Potential Energy (CAPE) values in excess of 2000 J/kg possible, thus it is worth monitoring the severe threat.

Ridge of high pressure likely builds to the south from Tuesday evening leading to fine conditions with a west coast trough deepening near the west coast thereafter.

A significant cold front likely moves over the region on Saturday followed by another significant cold front and cold air mass behind on Sunday but still some uncertainty on the details this far out.

The rest of Sunday May 16:

City:

Partly to mostly cloudy.

Chance of any rain:10%

Perth Metropolitan Area:

Partly to mostly cloudy.Winds northeasterly at 10-20 km/h.

Monday May 17:

City:

15-27  Degrees Celsius

PM shower or two, possible thunderstorm.

Chance of any rain:70%

Amount:2 to 15 mm

Perth Metropolitan Area:

Partly to mostly cloudy.A high(70%) chance of showers and thunderstorms from afternoon.Gusty winds ,heavy falls and hail possible with thunderstorms.Winds northeasterly at 15-25 km/h shifting northwesterly in the afternoon.

Tuesday May 18:

City:

15-24  Degrees Celsius

Showers.

Chance of any rain:80%

Amount:1 to 4 mm

Perth Metropolitan Area:

Partly to mostly cloudy.A high (70%) chance of showers.The chance of a thunderstorm.Light winds km/h shifting southwesterly at 10-20 km/h in the afternoon becoming light at night.

Wednesday May 19:

City:

12-23  Degrees Celsius

Partly cloudy.

Chance of any rain:10%

Amount:Nil

Perth Metropolitan Area:

Partly cloudy.Light winds tending south-southwesterly at 10-20 km/h in the afternoon becoming southeasterly at night.

Thursday May 20:

City:

10-25  Degrees Celsius

Sunny.

Chance of any rain:0%

Amount:Nil

Perth Metropolitan Area:

Sunny.Winds easterly at 10-20 km/h tending south-southwesterly at 10-20 km/h in the afternoon.

Friday May 21:

City:

10-23  Degrees Celsius

Mostly sunny.

Chance of any rain:10%

Amount:Nil

Perth Metropolitan Area:

Mostly sunny.Light winds tending southwesterly at 10-20 km/h in the afternoon.

Saturday May 22:

City:

12-21  Degrees Celsius

Showers.

Chance of any rain:90%

Amount:4 to 10 mm

Perth Metropolitan Area:

Partly to mostly cloudy.A very high (90%) chance of showers.Winds westerly at 15-30 km/h shifting southwesterly later during the day.

Sunday May 23:

City:

11-19  Degrees Celsius

Showers.

Chance of any rain:90%

Amount:5 to 15 mm

Perth Metropolitan Area:

Partly to mostly cloudy.A very high (90%) chance of showers.Winds west-southwesterly at 20-30 km/h.

Charts:

                                   

Figure 1.Surface synoptic chart.Image courtesy of the Australian Bureau of Meteorology(BOM).

 2. 

Figure 2.Key features identified on True Colour RGB satellite image.Satellite image courtesy of the Japanese Meteorological Agency(JMA).

Figure 3.Mean Sea Level Pressure(MSLP) analysis with infrared greyscale satellite image. Image courtesy of the Australian Bureau of Meteorology(BOM)

Figure 4:Surface synoptic prognosis.Image courtesy of the Australian Bureau of Meteorology(BOM).

No liabilities held from information consumed on this site. Weather icons are from the US National Weather Service.Some information on this site is from the Australian Bureau of Meteorology (BOM).